Q.

Tear gas used by the police to disperse the mob contains –

A. carbon dioxide
B. chlorine
C. ammonia
D. hydrogen sulphide
Answer» B. chlorine
Explanation: Tear gas is a compound. Each molecule of tear gas contains one atom of chlorine. The compound 2- chlorobenzalmalononitrile, a cyanocarbon, is the defining component of a "tear gas" commonly referred to as CS gas, which is used as a riot control agent.
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